MIMETITE, MINE DU MONT BONNIE, GROVE HILL, DISTRICT DE DALY, NT, AUSTRALIE (miniature)
MIMETITE, MINE DU MONT BONNIE, GROVE HILL, DISTRICT DE DALY, NT, AUSTRALIE (miniature)
La mimétite est un minéral composé de chlorure d'arséniate de plomb (Pb₅(AsO₄)₃Cl) qui se forme généralement comme minéral secondaire dans les gisements de plomb par oxydation de la galène et de l'arsénopyrite. Son nom dérive du grec Μιμητής (mimetes), qui signifie « imitateur », soulignant sa ressemblance avec la pyromorphite. Cette ressemblance est significative, car la mimétite fait partie d'une série minérale qui comprend à la fois la pyromorphite (Pb₅(PO₄)₃Cl) et la vanadinite (Pb₅(VO₄)₃Cl). On trouve notamment de la mimétite à Mapimi, dans l'État de Durango au Mexique, et à Tsumeb en Namibie.
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